I've been captured in my school uniform and locked up in a cage with no chance of escape. I'm begging and pleading to be let out but you say no, even though I *promise* that I'll be a good girl and I won't tell anyone if you do. You soon realise that the reason I'm begging so much is that I really, really, really need to pee! I plead and plead but instead you point to a small glass bowl in my cage. I'm humiliated and say no at first, but by now I don't have much choice. My hands are tied and I can't even remove my white cotton school girl panties and so in my desperation I pee through them into the bowl.